INDEX 



451 



Wound-reactions, 359, 375, 376, 397, 398. 

 Wound-stimuli, rate of propagation of, 359. 



Xylaria carpophila> geotropism of, 165. 



Yegounow, 353. 

 Yerkes, on photopathy, 229. 

 Yucca, 204; geotropism of rhizomes of, 

 164, of cotyledon of, 165. 



Zacharias, 232, 303. 



Zantedeschi, 176. 



Zea Mays, 182 ; geotropism of, 242 ; of 

 lateral roots, 163 ; nutation of, 20, 

 Fig. 2 ; rheotropism of, 184 ; thermo- 

 tropism of, 177. 



Ziegler, 302. 



Zikes, 317, 337. 



Zimmermann, 302, 323, 334, 340, 357, 360. 



Zoospores, amoeboid movements of, 275 ; 

 cilia of, 264 ; influence of light on, 

 318, 320; of light and temperature 

 on escape of, 153 ; of temperature 

 on movements of, 315, 316; photo- 

 taxis of, 322, 323, 324 ; speed of, 268 ; 

 swarming-period of, 267. 



Zopf, 46, 148, 149, 151, 165, 264, 275, 303, 

 313 ; on coiling of fungal hyphae, 46. 



Zygnema, fragmentation of, 148. 



Zygnemaceae, growth and nutation of, 31 ; 

 importance of autonomic curvatures 

 in, 24 ; movements of, 20. 



